Ok, so I've done some searching on this issue, and so far I don't have any resolution. I have Windows 7 Professional, 64 bit, and it was only seeing 8 of my 12 GBs of DDR3 RAM. CPU-Z saw all 12 GBs. Thinking that maybe I just had some bad memory (and using it as an opportunity to upgrade), I purchased 24 GBs of DDR3-1600, and installed all 6 sticks last night. Now, Windows (and the BIOS) only sees 16 GBs of the 24. It seems that no matter what I do, the OS (and BIOS) only picks up 2/3 of my overall RAM. I do not have the "Maximum Memory" box checked in msconfig. Furthermore, I do not have any "memory remap" (or anything even close) in my BIOS. Here is a screenshot to show what I'm talking about... See the areas circled in red. The first screenshot shows what I was seeing with 12 GBs installed, here => http://i291.photobucket.com/albums/ll302/TRWeiss1/Windows_Not_Seeing_All_RAM-1.png
This screenshot shows what I see now, with 24 GBs installed, here => http://i291.photobucket.com/albums/ll302/TRWeiss1/Not_Seeing_All_RAM.jpg
System Specs:
Intel i7 920 bloomfield @ 4.00GHz w/ Noctua U12-P
24GBs DDR3-1600 Ripjaws memory, triple channel
ASUS P6X58D Premium Mobo
Sapphire HD 7970 Vapor-X Ghz Edition
512GB OCZ SSD
Windows 7 Professional 64-bit
I also tried backing the overclock completely out. This doesn't change the amount of memory the system sees, even after reverting to factory specs. I thought I had found a shred of hope when I realized that I hadn't updated my BIOS in quite some time, and was on rev 1002. I went to ASUS' website, got the latest BIOS, and flashed it. My hopes were high, seeing as how several of the BIOS revisions were for "memory compatibility" fixes. Unfortunately, after flashing the BIOS to the most recent rev, it still only sees 2/3 of the memory.
Then, late last night I went even deeper into the twilight zone. I figured I'd try 1 stick of RAM in EACH slot, seeing if I could isolate any bad ones. You know, put 1 stick in 1 slot, power on, verify that it posts, check the memory in BIOS, move it to the next slot, then repeat... Know what I found? The PC won't even POST unless there is a stick of RAM in ALL 6 slots. How's that for weird? WTF is going on here?! If I knew for sure it was just a bad mobo (or bad slots) I'd just purchase a new one... It has been like this since day 1 though, since I built this rig back in '09.
What I think confuses me the most is WHERE is CPU-Z getting its data from?? Because it clearly always knows the correct amount of physical RAM installed. It saw the full 12 GBs when I had that installed, and now it sees the full 24 GBs. Now, if CPU-Z agreed with what the BIOS and Windows are reporting, it would seem to be an open and shut case of 2 bad DIMM slots... But CPU-Z reports the correct amount of memory EVERY TIME. Anyone ever heard of anything like this? Some insight/help would be much appreciated! Thanks.
This screenshot shows what I see now, with 24 GBs installed, here => http://i291.photobucket.com/albums/ll302/TRWeiss1/Not_Seeing_All_RAM.jpg
System Specs:
Intel i7 920 bloomfield @ 4.00GHz w/ Noctua U12-P
24GBs DDR3-1600 Ripjaws memory, triple channel
ASUS P6X58D Premium Mobo
Sapphire HD 7970 Vapor-X Ghz Edition
512GB OCZ SSD
Windows 7 Professional 64-bit
I also tried backing the overclock completely out. This doesn't change the amount of memory the system sees, even after reverting to factory specs. I thought I had found a shred of hope when I realized that I hadn't updated my BIOS in quite some time, and was on rev 1002. I went to ASUS' website, got the latest BIOS, and flashed it. My hopes were high, seeing as how several of the BIOS revisions were for "memory compatibility" fixes. Unfortunately, after flashing the BIOS to the most recent rev, it still only sees 2/3 of the memory.
Then, late last night I went even deeper into the twilight zone. I figured I'd try 1 stick of RAM in EACH slot, seeing if I could isolate any bad ones. You know, put 1 stick in 1 slot, power on, verify that it posts, check the memory in BIOS, move it to the next slot, then repeat... Know what I found? The PC won't even POST unless there is a stick of RAM in ALL 6 slots. How's that for weird? WTF is going on here?! If I knew for sure it was just a bad mobo (or bad slots) I'd just purchase a new one... It has been like this since day 1 though, since I built this rig back in '09.
What I think confuses me the most is WHERE is CPU-Z getting its data from?? Because it clearly always knows the correct amount of physical RAM installed. It saw the full 12 GBs when I had that installed, and now it sees the full 24 GBs. Now, if CPU-Z agreed with what the BIOS and Windows are reporting, it would seem to be an open and shut case of 2 bad DIMM slots... But CPU-Z reports the correct amount of memory EVERY TIME. Anyone ever heard of anything like this? Some insight/help would be much appreciated! Thanks.